Correct Answer - D
Quite often for reaction to occur some covalent bonds must be broken so that others can be formed. This can occur only if the reaction molecules collide with enough kinetic energy to overcome the potential energy stabilization of the bonds.
According to the transition state theory, the reactants pass through a short-lived, high-energy intermediate state, called a transition state, before the products are formed.
`underset("Reactants")(A+B-B)rarrunderset("transition state")(A....B...B...)rarrunderset("products".)(A-B+B)`
